Question

D o thissssss......with a note... How will do this??

Answer 1

hey there,

here is ur answer

as the above mentioned triangle being a scalene trinagle with sides
13,14,15
there is a formula
where
whole root of
s(s-a)(s-b)(s-c)
where s is the semiperimeter and
it is the sum of all sides divided by 2
$13 + 14 + 15 \div 2$
$42 \div 2$
which is
21
now applying the formula
we get,

21(21-13)(21-14)(21-15) whole root
21(8)(7)(6)
which is
7056 whole root
84cm^2
a b and c are the three different sides

hope this helps u
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sid071

Answer 2

Given,
sides of triangle are 13cm, 14cm and 15 cm
s(semi-perimeter) = (13+14+15)/2
= 21 cm
area of triangle using Heron's formula is
$\sqrt{s(s - a)(s - b)(s - c)}$
$\sqrt{21(21 - 13)(21 - 14)(21 - 15)}$
$\sqrt{21 \times 8 \times 7 \times 6}$
$\sqrt{3 \times 7 \times 2 \times 2 \times 2 \times 7 \times 2 \times 3}$
= 2×2×3×7 sq.cm
=84 sq.cm